As I wasn't there, I would recommend that if anyone did consider the Police response inappropriate, they should make a formal complaint.
I presume, if there is a case to answer, there will be witnesses - protestors and Boots employees, at least?

Erm, excuse me for butting in here, but have you ever heard of Ian Tomlinson, Jean Charles De Menezes, or Blair Peach ? There were quite a lot of witnesses/evidence you know, and, here's the curious bit, guess what ?